PHP表单验证和处理同一页面

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great to validate and process a form in the same page
  1. <?php
  2.  
  3. function VerifyForm(&$values, &$errors)
  4. {
  5.     // Do all necessary form verification
  6.  
  7.     if (strlen($values['name']) < 3)
  8.         $errors['name'] = 'Name too short';
  9.     elseif (strlen($values['name']) > 50)
  10.         $errors['name'] = 'Name too long';
  11.  
  12.     // Needs better checking ;)
  13.     if (!ereg('.*@.*..{2,4}', $values['email']))
  14.         $errors['email'] = 'Email address invalid';
  15.  
  16.     if (strlen($values['text']) == 0)
  17.         $errors['text'] = 'Text required';
  18.  
  19.     return (count($errors) == 0);
  20. }
  21.  
  22. function DisplayForm($values, $errors)
  23. {
  24.     ?>
  25.     <html>
  26.     <head>
  27.         <title>Yadda yadda</title>
  28.         <style>
  29.             TD.error
  30.             {
  31.                 color: red;
  32.                 font-weight: bold;    
  33.             }
  34.         </style>
  35.     </head>
  36.     <body>
  37.  
  38.     <?php
  39.     if (count($errors) > 0)
  40.         echo "<p>There were some errors in your submitted form, please correct them and try again.</p>";
  41.     ?>
  42.  
  43.     <form action="<?= $_SERVER['PHP_SELF'] ?>" method="POST">
  44.     <table>
  45.         <tr>
  46.             <td>Name:</td>
  47.             <td><input type="text" size="30" name="name" value="<?= htmlentities($values['name']) ?>"/>
  48.             <td class="error"><?= $errors['name'] ?></td>
  49.         </tr>
  50.         <tr>
  51.             <td>Email:</td>
  52.             <td><input type="text" size="30" name="email" value="<?= htmlentities($values['email']) ?>"/>
  53.             <td class="error"><?= $errors['email'] ?></td>
  54.         </tr>
  55.         <tr>
  56.             <td valign="top">Text:</td>
  57.             <td>
  58.                 <textarea name="text" cols="30" rows="6"><?= htmlentities($values['text']) ?></textarea>
  59.             </td>
  60.             <td class="error"><?= $errors['text'] ?></td>
  61.         </tr>
  62.         <tr><td colspan="2" align="center"><input type="submit" value="Submit"></tr>
  63.     </table>
  64.     </form>
  65.  
  66.     </body>
  67.     </html>
  68.     <?php
  69. }
  70.  
  71. function ProcessForm($values)
  72. {
  73.     mail('[email protected]', 'Form test', $values['text'], "From: "{$values['name']}" <{$values['email']}>");
  74.  
  75.     // Replace with actual page or redirect :P
  76.     echo "<html><head><title>Thank you!</title></head><body>Thank you!</body></html>";
  77. }
  78.  
  79. if ($_SERVER['REQUEST_METHOD'] == 'POST')
  80. {
  81.     $formValues = $_POST;
  82.     $formErrors = array();
  83.  
  84.     if (!VerifyForm($formValues, $formErrors))
  85.         DisplayForm($formValues, $formErrors);
  86.     else
  87.         ProcessForm($formValues);
  88. }
  89. else
  90.     DisplayForm(null, null);
  91. ?>

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